I need proficient help in the following problem:
Problem: An airplane is flying through a thundercloud at a height of 2 000 m. (This is a very dangerous thing to do because of updrafts, turbulence, and the possibility of electric discharge.) If there is a charge concentration of +40 C at height 3 000 m within the cloud and -40 C at height 1 000 m,
A- What is the magnitude of the electric field E at the aircraft?
If possible just a brief explanation how you got the answer?